Scores 35/35 for dosage transparency, 22/25 for a clean formula, 24/25 for label completeness. 7 ingredients disclosed with amounts.
capsule · 30 servings · $0.80/servingBuy on iHerb$24.00
Ranking
10 Best Mineral & Electrolyte Supplements
Single minerals such as selenium, iodine and chromium are dosed in micrograms, which leaves little room for error: a few tablets too many can pass the NIH upper limit. Clear labels state the elemental amount and the form.
We ranked selenium, iodine, chromium, potassium, trace mineral and electrolyte products sold on iHerb by label quality. Magnesium, calcium, zinc and iron have their own rankings.
Our top picks
Scores 35/35 for dosage transparency, 25/25 for a clean formula, 21/25 for label completeness. 7 ingredients disclosed with amounts.
liquid · 96 servings · $0.40/servingBuy on iHerb$37.99
Scores 35/35 for dosage transparency, 25/25 for a clean formula, 21/25 for label completeness. 7 ingredients disclosed with amounts.
liquid · 6 servings · $0.86/servingBuy on iHerb$5.14
Top 10 ranked
#ProductScoreFormServingsPrice
How we ranked them
Every product is scored 0–100 from its label data in the NIH Dietary Supplement Label Database: dosage transparency (35 points - are amounts stated per ingredient, or hidden in a proprietary blend?), label completeness (25), formulation cleanliness (25 - fillers, dyes, titanium dioxide and other non-active ingredients) and ingredient profile (15). The Top 10 admits only products scoring 60 or higher; among those, products with a verified retail listing are shown first so the list is one you can act on. No brand can pay to be included or moved up.
Forms and dosage
- Selenium (selenomethionine, sodium selenite)
- Usually 50–200 mcg per serving.
- Iodine (potassium iodide, kelp)
- Kelp products vary widely in iodine; the label should state micrograms of iodine, not kelp weight.
- Chromium, molybdenum, boron
- Trace minerals in micrograms or milligrams.
- Electrolytes and potassium
- Supplements usually provide 99 mg of potassium or less per serving.
How much to take
NIH upper limits for adults: selenium 400 mcg, iodine 1,100 mcg, boron 20 mg, molybdenum 2,000 mcg per day. Count all sources, including multivitamins.
Who it's for
Adults filling a specific gap, such as iodine in a diet without iodized salt, ideally confirmed by a clinician.
What to watch out for
Kelp with no stated iodine content, selenium stacked across several products, and electrolyte mixes with undisclosed amounts.
All Minerals & Electrolytes products (2697)
1
Thorne ResearchTrace Minerals
892Trace Minerals ResearchConcenTrace Trace Mineral Drops
893Trace Minerals ResearchLow Sodium ConcenTrace Trace Minerals Drops
894NOWKelp
885NutricostVanadium 2 mg
886Nature's WayBladderwrack Whole Thallus 580 mg
887SolarayKelp 550 mg
888Nature's WayBladderwrack Whole Thallus
889JYM Supplement ScienceZMA JYM
8710Innate Response FormulasSelenium
8711ThorneTrace Minerals
8712Natural FactorsChromium & Vanadium 125 mcg
8613NOWChromium Picolinate 200 mcg
8514NOWFull Spectrum Minerals Caps
8515Swanson Premium BrandSelenium (L-Selenomethionine) 100 mcg
8516Swanson Premium BrandSelenium 100 mcg
8517Pure EncapsulationsIodine (Potassium Iodide)
8518SwansonSelenium 100 mcg
8519NutriCologySelenium Solution
8520MegaFoodSelenium
85Frequently Asked Questions
How much selenium is too much?
The NIH upper limit is 400 mcg per day from all sources. Brazil nuts alone can contain a lot, so add up everything you take.
Why is potassium in supplements so low?
Most potassium supplements stay at 99 mg or less per serving because higher-dose potassium pills have been linked to gut injury.
How are minerals & electrolytes supplements ranked?
Products are ranked by SupplementScore, which evaluates label quality across four categories: dosage transparency (35 pts), label completeness (25 pts), formulation cleanliness (25 pts), and ingredient profile (15 pts). The score is based on data from the NIH Dietary Supplement Label Database, not marketing claims.
Does a higher score mean the supplement is more effective?
No. The SupplementScore measures label quality, how transparent, clean, and well-documented a product is. It does not measure clinical efficacy, bioavailability, or third-party testing. A higher score means better label practices, not guaranteed results.
How many minerals & electrolytes supplements were analyzed?
We analyzed 2,697 minerals & electrolytes products from the NIH DSLD database, which contains label data for over 116,000 dietary supplements sold in the United States.
This article is for information only and is not medical advice. Talk to a clinician before starting a supplement, especially if you are pregnant, take medication or have a health condition.